欢迎访问《生物质化学工程》,

生物质化学工程 ›› 2017, Vol. 51 ›› Issue (4): 8-16.doi: 10.3969/j.issn.1673-5854.2017.04.002

• 研究报告 • 上一篇    下一篇

纤维素热解动力学分析方法研究

白斌1, 周卫红1, 丁毅飞2, 徐安壮1, 王玉杰1, 丁伟婧1   

  1. 1. 辽宁科技大学 土木工程学院, 辽宁 鞍山 114051;
    2. 鞍钢集团工程技术有限公司, 辽宁 鞍山 114021
  • 收稿日期:2016-10-16 出版日期:2017-07-30 发布日期:2017-08-03
  • 通讯作者: 周卫红,副教授,硕士生导师,主要从事生物质能源综合利用等方面研究,E-mail:zwh_0190@sina.com E-mail:zwh_0190@sina.com
  • 作者简介:白斌(1992-),男,山西阳泉人,硕士生,主要从事生物质热解催化气化研究
  • 基金资助:
    辽宁省教育厅一般项目(L2014121);辽宁科技大学研究生教育改革与科技创新创业项目(LKDYC201614)

Analysis Method of Cellulose Pyrolysis Dynamics

BAI Bin1, ZHOU Weihong1, DING Yifei2, XU Anzhuang1, WANG Yujie1, DING Weijing1   

  1. 1. School of Civi Engineering, University of Science and Technology Liaoning, Anshan 114051, China;
    2. Ansteel Engineering Technology Co., Ltd., Anshan 114021, China
  • Received:2016-10-16 Online:2017-07-30 Published:2017-08-03

摘要: 以微晶纤维素为原料,在氮气气氛中利用热重分析仪考察了不同升温速率条件下纤维素的热解实验,分析了纤维素的热解动力学特性。采用双等双步法和Popescu法从热分析动力学的41种机理函数中选取最概然反应机理函数,同时运用Freeman-Carroll法、Coats-Redfern法、Starink法和双等双步法4种热分析方法计算热解反应活化能(E)、指前因子(A),并对结果进行了分析比较。结果表明,随着升温速率提高,纤维素热解起始温度增加,热失重速率升高;纤维素的热解过程可分为4个阶段:脱水预热(40~120℃)、热解初期(120~260℃)、主要热解失重(260~400℃)和炭化(400~900℃)。纤维素主要热解段分两个阶段进行,其活化能在低温段(260~350℃)时,为166~176 kJ/mol,高温段(350~400℃)时,为171~216 kJ/mol;采用反Jander动力学模型能较好地描述主要热解反应过程;采用单一扫描速率法(Freeman-Carroll法和Coats-Redfern法)分析结果与实际值有较大偏差,多重扫描速率法(Starink法和双等双步法)得到的结果更具可靠性。

关键词: 纤维素, 热解, 热重分析, 动力学

Abstract: With microcrystalline cellulose as raw material, cellulose pyrolysis experiments under different heating rates were carried out in nitrogen atmosphere by thermogravimetric analyzer, and the pyrolysis kinetic characteristics of cellulose were analyzed. The most probable reaction mechanism function was selected from 41 mechanism functions of thermal analysis kinetics by using the double equal-double steps method and Popescu method, meanwhile, four different thermal analysis methods (Freeman-Carroll method, Coats-Redfern method, Starink method, double equal-double steps method) were used to calculate the activation energy (E) and pre exponential factor (A) of pyrolysis reaction, and the results were analyzed and compared. The results showed that with the increase of the heating rate, the initial pyrolysis temperature of cellulose increased and the rate of pyrolysis weight loss increased; the pyrolysis process of cellulose could be divided into 4 stages, dehydration preheating section (40-120℃), the early period of pyrolysis (120-260℃), the main pyrolysis section (260-400℃) and carbonization section (400-900℃); the main cellulose pyrolysis section was divided into two stages and the activation energies at low temperature (260-350℃) and high temperature (350-400℃) were 166-176 kJ/mol and 171-216 kJ/mol, respectively; anti Jander kinetic model could describe the reaction process of main pyrolysis well; by using single scanning rate method (Freeman-Carroll and Coats-Redfern), the analysis result had a great deviation from the actual value, and the results obtained by the multiple scan rate method were more reliable.

Key words: cellulose, pyrolysis, thermogravimetric analysis, dynamics

中图分类号: